[Discuss-gnuradio] A question about general_work() function

[Dawei Shen]

Hello Everyone

I have got a problem which arised from my project. Here is what I want to do: I am trying to implement a Viterbi algorithm. Suppose 
"in" is the input stream, I want to use in[0], in[1]....in[6], seven
elements to initialize the Viterbi algorithm. Then from in[7], I start
to use Viterbi algorithm to do tracking. Now the problem comes, in the
"general_work()" function, I did something like this:

int general_work(arg1, arg2, arg3, arg4) {
    for (int i = 0; i < 7; i++) {
        use in[i] to intialize the Viterbi algorithm;
    }
    for (int i = 8; i < ninput_terms; i++) {
        use each in[i] to do Viterbi algorithm tracking;
        out[n] = something
    }
}

However, the
results told me this is a wrong way. Because the initialization part
(the for i=0, i<7, i++ part) would be executed for many many times. It
appeared to me that the scheduler would try to call the general_work
function for many times and each time it calls it, everything in the
function would be executed from the beginning to the end. For example,
if I write a line

printf("can you see me?\n");

and put it in front of the
first 'for' iteration, I can see the printed output many times. This
thing totally disturbed what I wish to do. Am I understood?

Could anyone provide any help or insights? Thanks in advance.

Best Regards
Dawei